Method and apparatus for securing elements together



Dec. 26, 1939. E. R. cAPlrA l 2,184,282

METHOD AND APPARATUS FOR SECURING ELEMENTS TOGETHER Filed July 26, 19352 sheetsssneet 1 E. R. CAPITA Dec. 26, 1939.

METHOD AND APPARATUS FOR SECURING ELEMENTS TOGETHER Filed July 26, 19352 Sheets-Sheet 2 fab/m75 or CL/E/VT ,Vin

f 4a gym) cfm/tm yiwi/M2 Patented Dec. ze, 1 939 UNITED STATES METHODAND APPARATUS FOB. SECURING ELEMENTS TOGETHER Emil R. Capita, New York,N. Y.

Application July 26, 1935, Serial No. 33,336

24 Claims.

This invention relates to a method and appara.- tus for securingelements together, at least one of which is susceptible to heating byinduced electrical current, and more particularly to a 5- method andapparatus for securing sealing elements to closures, in which theclosure shell is of material, such as tinplate, which may be readilyheated by induced electrical current, and also contemplates the adhesionof spots to liners in closures wherein the spot is made of conductingmaterial capable of being inductively heated.

According to a preferred embodiment of this invention, a liner, spot orgasket vis secured to a. closure shell, or to a sealing element, in thecase of a spot, by means of heat electrically induced and generatedwithin one of the parts. The heat so generated may be effective forcausing softening of an adhesive lacquer coating, coagulating andsetting a heat coagulable adhesive, or may be effective for setting aheat convertible binder for a plastic mass incorporated in or carried byone of the parts, such for example as vulcanizing a ubber disk, washeror gasket or flowed in composition layer which,

$5 upon vulcanizatlon or setting, may serve as a sealing liner. It willbe understood, therefore, that the term securing elements together shallinclude the setting or vulcanization of a plastic or owable mass (aswell as a preformed ele'- ment) in situ within or upon a conductingelement.

This invention contemplates a method and apparatus in which theinduction heating of the conducting element is effected while theelement Sli is in movement and the neld of electrical current from asuitable establishing. means, such as a coil is moved-preferably infixed relationship with respect to the element to be heated-and in whichthe coil is so formed and positioned that 40 heating of the conductingelement is limited to a specific or predetermined portion thereof. In amore specific sense, this invention embodies a method and apparatuswherein the high frequency current, supplied to a coil or otherestablishing means adapted to move in fixed relationship to an elementto be inductively heated, is commuy tated in'order that the supply ofcurrent to the coil may be effectively and closely controlled.

In prior attempts to secure sealing liners or gaskets to closures bymeans of heat, serious difficulties have been encountered by reason ofthe softening of the decorations applied to the closures, inasmuch asthe heat has not been readily controllable. The heating has been geno5erally effected while the closures are intermit- -illustrated inconnection with the assemblycof tently moved along a support; the heatnot onl softening or setting the adhesive but also softening thedecoration to some extent, at which time the decoration has beensusceptible to scarring or removal. Other difficulties have arisen by 5reason of the discoloration of applied decorations,

particularly light colored decorations, from the flames employed; andfrom the lack of control of the precise amount of heat required toeffect -a union. Further disadvantages reside in the ino ability toapply the heat only to the portion of the closure where it is requiredto effect a union` between the parts sought to be united.

The assembly of closures has been relatively slow in prior systemsbecause of the inability of the prior art mechanisms to impart sufcientheat in a relatively shortl time without scorching or discoloring thedecoration and without marring or removing the decoration by the meansemployed to move the closures over or along the heating zone. Fingerbars, for example, reciprocating intermediate adjacent closures andmoving them forwardly while the closures are being heated, are prone toskin the marginal decorations from the closures. The speed of themachines of this type is determined entirely by the length of theheating zone, since the heating is effected by passing the closuresthrough the zone. In order to obtain a high speed assembly with priorart machines, the heating zone must 30 be relatively long, thusconsuming valuable oor space. Furthermore, the prior art machines arenot capable of' close control or adjustment whereby the degree and timeof heat for different types of adhesives may be readily obtained insucceeding production runs. The lforegoinfr disadvantages are obviatedby the present ivention and advantages are derived which will laterbecome apparent. c, ,y My invention is particularly adapted for use in.40' connection with a machine such as describedand, y claimed in acopending application of Ralph Rw fClark, Serial No. 72,489, iiledvApril3,fi:l'936,.l

wherein the method and apparatusis specifically z' crown closures. Inanother copending applica--` tion of Ralph R. Clark, Serial No,` 33,205,filed July 26, 1935, the method of securing liners, and spots and thesetting of heat setting or yvulcan 50 izible plastics, to serve assealing liners, by in,- duction heating is illustrated and described andbroadly claimed. j

In order that my invention may be readily and clearly understood, I willdescribe a preferred embodiment thereof in connection with theaccompanying drawings, in which:

Figure 1 diagrammatically illustrates the present preferred circuit forsupplying electrical energy and its connection to the heating elements;

Figure 2 illustrates a closure in conjunction with a preferred form ofheating or radiating coil;

Figure 3 diagrammatically illustrates a mechanism for transportingclosures in conjunction withvthe radiators or heating-elements;

Figure 4 is a sectional view taken on the line IV-IV of Figure 3;

Figure 5 is a top plan view of the form of heating coil; and

Figure 6 is a sectional view illustrating a pressure applyingmechanism', of the type disclosed in the Clark application abovereferred to, for affixing sealing liners to crowns.

I prefer to use the heating effect produced in a metallic body by a highfrequency electrical field. Certain limitations arise in the applicationof high frequency electrical fields in that parts of the mechanism areadvantageously made preferred of metal and should not be hot to thediscomfiture of operators on the machine. The exposed machine parts arepreferably ground potential. It is of some importance that the articlesto be heated be disposed closely adjacent the energy coil in order toconfine the field as much as possible to avoid losses and to direct andcontrol the iieldyas much as possible.

When employing my invention in a crown assembly machine of the typereferred to in the Clark application above referred to, I prefer toemploy for energizing the radiating coils, the symmetrical circuit-illustrated and described in my copending application, SerialI No.33,337, filed July 26. .1935, entitled Heating apparatus and supplytherefor.

This circuit is diagrammatically shown in Figure 1 and comprises acircuit having a theoretical zero potential through its axis of symmetrywhereby the electrical stresses, which would resultwere one side of theoscillatory circuit grounded, are avoided. In a machine of the Clarktype, above referred to, the mechanism is, in general, grounded and acircuit should be utilized which will avoid electrical losses by conningthe field and preventing arcing with the grounded metal parts.

vThe circuit comprisesan input transformer Tv having a tapped primary 2,supplied with electrical energy through 'leads 3 and 4 from a suitablelow frequency source -of current C. Breakers B are shown intermediatethe source C and the primary 2 and will be more fully hereinaferdescribed. The secondary 5 of the transformer T has a relatively highpotential and is connected through damping resistors 3 and 1 to asymmetricaL-snlit. quenched spark gap having sections 8 and 9 thereofconnected by a variable inductance I0. 'I'he ends of the gap areconnected through equal blocking condensers II and I2 to a tankcondenser I3, connection being made through leads Il and I5 tocondensers I6 and I1 which are connected in series, forming part of thetank condenser I3; it being my preference that leads I I and I5 be' ofequal potential but of opposite sign during the operation of theoscillatory circuit. The secondary circuit for the high frequencycurrent comprises coils 22 and the tank condenser I3 in series withthem. Sections I6, I1, I8, I3, 20, and 2l of the tank Acondenser I3 arein series in order to facilitate tapping to effect capacity couplingbetween the primary and secondary high frequency circuits.

The circuit and its operation is more particularly illustrated anddescribed in. my said copending application and a more detaileddescription will not, therefore, be given. For operation of the deviceand method of my invention, it will suffice if the current be ofsumcient intensity and of such frequency that the coils will beeffective for inducing suiiicient current in a conducting element tosatisfactorily heat the element to the desired temperature. 0f course,in a machine of the Clark type, the preferred circuit of my saidapplication is desirable. Other systems may be employed for generatinghigh frequency current provided adequate safeguards be provided in themachine to prevent excessive losses and heating of the machine parts.

'I'he high frequency current is fed to heating coils 22 which areconnected in series and which, as diagrammatically shown in Figures 3and 4, may be'mounted for rotation on a disk 23. In order that theradiators 22 be energized for a predetermined portion of the cycle ofthe disk 23 and remain uncharged for another portion of the cycle,groups of coils 22 are connected to commutatcr bars, each group beingconnected to a segmental portion of commutatcr bars 24 and 25.

As an example, withA a disk having positions for I heating unitsthereon,it may be found desirable to have twelvesections on the disk, eachsection comprising agroup of twelve coils. In Figure 1 groups a, b, c,d, and l are illustrated. The individual coils of each group areconnected in series and each group is connected lto a segment of each ofthe commutatcr bars 24 and 25; each segment being of the same length andeach occupyinga predetermined position on the disk 23.

Current is supplied from the high frequency generator to the segmentsthrough brushes 23 and 21; the brushes 26 and 21 being so spaced thatthey supply energy to a predetermined number of segments, which in thepresent embodiment is three. The intermediate groups of coils areconnected in series by means of brushes 28 and 29, and 30 and 3|,whereby a total of thirtysix coils are at all times in seriesconnection; the brushes being stationary and feeding current to thecoils 22 through the commutatcr bars 24 and 25 upon rotation of the diskand the bars thereabout.

The positioning of the brushes 25 and 21 determines the length of theheating zone, and may be Varied to suit individual heating requirementsand speed of operation.

Now referring to AFigure 3 it will be observed that the brushes areshown in such position that sections a to c are energized and that, withthe disk 23 travelling in the direction of the arrow, section d will benext energized. Bo long as section a Vis receiving current, section dwill not be energized, but immediately section a moves past brushes-21and 28, brushes and 3| will engage the commutator segments of section d,thereby completing the circuit for that section; it being borne in mindthat the coils and commutatcr bars revolve as4 a unit about the brusheswhich are fixed on the machine. By this system, each individual coil isenergized for the same period of time regardless of the position itassumes in the group.

In order that the elements to be heated be positioned adjacent the fieldestablishing means prior to the energization of any given group ofaieaaaa equivalent to a segment, which in the illustrated embodiment isthe space between twelve coils. The elements are preferably fed insingle series as shown in the Clark applicationy and the loading for anygiven group is complete prior to the application of current to thatgroup, thus assuring that all of the elements will be subjected to thehigh frequency field for the same period o f time. Current, of course,is` applied to any given group so long as the brushes are in contactwith their commutator lbar segments.

When operating upon certain types of elements, such for example as crownshells in which a sealing liner is to be secured by means of aninterposed adhesive lacquer, it is desirable to heat and after softeningof the adhesive to cool under pressure. When this cooling is desired thedisk 23 is made of sufficient diameter to provide a cooling zoneintermediate the heating zone and the unloading position. As shown inFigure 3 where'sections a to c are under heat, sections l, k, 7', i, h,and g-are being cooled and unloaded at section f, while new elements arebeing inserted at section e. If no cooling zone is' required, theheating zone may be extended to cover additional sections and the speedof revolution increased or the elements may be unloaded atany positionintermediate the heating zone and loading station dependinguponexisting'con'ditions.

Itrhas been found in commercial production that there is a tendencyforthe brushes to arc to segments; arcs being thrown from the brush tothe next oncoming segment of thecommutator bars as they approach thebrush. This results in burning ofthe leading edges of the commutatorbars of each section, and in orderV to overcome this, the breakermechanism shown in Figure l is employed. y

The breaker is positioned between the source of current C and theprimary 2 of the input transformer T and comprises a pair of switches 32and 33 connected to an arm 34 controlled by a solenoid 35 which issupplied with energizing current by a battery 36. The switches 32and 33are normally closed, but are shown in open position in Figure 1. Thesource of current 36 is fedto the solenoid by leads 31 and 38 and lead31 is provided with a contact switch 39 which is shown in open positionin Figure l. The switch 39 is controlled by a cam 40 which is geared tothe' disk 23 and rotates in unison therewith.' The shape of the cam 4Dand the speed of rotav tion thereof is so determined that the switch 39is opened immediately prior to the time when each commutator segment isleaving the brush and is closed after the brush is in engagement withthe next succeeding segment, thus insuring that the breakers will beopen during the time when a segment leaves a brush and the nextsucceeding segment immediately approaches and engages the brush. Whenthe breakers 32 and 33 are open, resistors 4| and 42 `are connectedacross-the leads from the source of current C to the primaryl 2 andresult merely in a diminution of current supplied to the primary, thecurrent supplied through the resistors being insufficient to cause thegaps to strike, thus obviating arcing across the adjacent vcomrnutatorsections. Thus the charging current for the core of the transformer T isflowing when the breakers are open, and hysteresis losses are minimizedand surges are avoided.- A condenser 43 of proper capacity the action ofthe breakers 32 and 33.

' i's connected across the primary 2 for smoothing In Figure 2, I haveillustrated to enlarged scale a cross sectional view of a closure and mypre-l ferred type of coil b22. The coil 22 is shown in plan in Figure 5and comprises a spiral conducting element having turns spaced for thepassage of cooling air, and having a generally open center to avoidself-heating; the number -of turns along any radius being substantiallyequal toproduce an even 'field for the generation of an even heatingeffect in an element to be heated.

As shown in Figure 2, the flux F from the coil 22 threads the closure 44through the top thereof and it will be observed that the skirt 45 issubstantially unaffected by the flux F. I have found, as a matter offact, that it is possible to melt the top from a standard tin plateclosure withcut materially affecting the decoration applied to the skirtthereof. This latitude of control in a heating effect is of considerableimportance, `making my method and apparatus available for many types ofadhesives and many types of lining compositions. It will be observed bya study of Figure 2 that' the most intensive heating effect in the topof the closure 44 is in the center portion thereof.; it being observedthat the flux adjacent the skirt is distributed over a greater area thanthe same flux threading the center part. This is desirable in thatadhesive applying mechanisms, as currently available, normally applythe'adhesive in the center of the top of the closure. Other spacing ofthe coil 22 and the closure '44 will result in other distribution of theflux and various effects can be obtained as desired.l The design of mycoil, however, permitsY very close spacing between the coil and theelement to be heated, which permits heating with a power input greatlydiminished from that which would b'e required for the same heatingeilect with the element and coil Yspaced further apart;'

the field strength following a power law rather than a linear law. Thesymmetrical circuit illustrated in Figure l contributes to the economyof the arrangement since it permits the coil to be closely spaced eventhough the closure be grounded, which latter condition for ease ofmechanical construction is most desirable. The disadvantage of anonsymmetrical circuit would be that the potential difference betweenthe coil and the\ closure would be larger and would require greaterspacing which would in turn require greater input power and, there beingreasonable limit on the current, would require still greater' potential.Even though the element to be heated is not grounded, the arrangementdescribed is desirable in that power is saved. 'I'he symmetrical powersystem permits very close spacing of coils and ungrounded elementsinasmuch as the potential difference between the coils and ground ismaterially lower than in the case of a power supply having one sidegrounded.

In Figure 6 there is shown the coil of my invention positioned in theClark mechanism and showing my improved mechanism wherein the coils areadapted to move with the element to be heated, whereby heating iskeffected byelectrical currents induced in a conducting element which isin motion, perferably in closed path.

The coil 22 is positioned in a ring 46 of nonconducting material. Acovering ring 41, is positioned over the coils 22 and is also formed ofsome non-conducting material such as Bakevli Openings 48 are provided inthe ring 45 and similar openings 49 are provided in the cover Il.v Airmay be driven through these openings to cool the coil 22 and also tocool the under or decorated side of the closure 44 positioned inthefield of the coil 22.

If the elements to be secured together require the application ofpressure at any stage during the uniting operation, such as is desirablein-the assembly of a sealing gasket with a crown cap shell ,in which anadhesive forms the bondingI agent, a suitable spring vurged plunger 50may be, employed to urge the gasket into engagement with the shell ofthe crown 44; the inner surface of the lshell being preferably coatedwith adhesive lacquer or other heat convertible adhesive. It will benoted that the coil 22 is spaced closely to the'element 44 to be heatedand that the plunger 50 and the liner guide ring 52, which are grounded,are spaced in close relationship to the field of the heating coil. Theuse of a symmetrical circuit ofthe type disclosed in my copendingapplication permits this construction l lwithout serious loss by heatingof the machine parts. n

The method of operating my device has been described in connection withthe detailed disclosure of the apparatus and a restatement of the methodwill not, therefore, be given. It will suiiice to state that the methodincludes the step of subjecting an element capable of being heated byinduced electrical currents to a high frequency field while the elementis in motion and moving the field and element together until thevtemperature inthe element has risen to the proper degree. v I

From the foregoing'disclosure it will be clear that my apparatuscontemplates means for posi- 'tioning an'element in spaced relationshipwith respect to a coil for establishing a high frequency field and meansfor moving the coil and element to be heated while maintaining the coiland element in fixed, spaced relationship. It will be further observedthat my mechanism includes a type of coil construction which permits auniform rise in temperature over a restricted portion of an element tobe heated and further contemplates a mechanism inwhich induction heatingmay be effected for a portion of the cycle followed by an elementtraveling in a closed path; energization of a coil for effecting suchheating -being effected through a commutator bar and a brush, one ofvwhich moves with respect 'to the other.

While I have illustrated and described the present preferred embodimentof my invention, it will be understood that my invention is'not solimited but may otherwise be practiced and embodied within the scope ofthe following claims.

I claim:

l. In theJ method of securing two elements together, at least one ofwhich is susceptible to heating by induced electrical currents and isrelatively thin, and at least one of. which carries a heat activatablebonding agent, the steps consisting in subjecting at least the elementcapable of being heated by induced electrical currents y to a highfrequency field while said element is in motion, and moving said fieldand element together until temperature is reached sufficient to activatesaid bonding agent.

2. In the method of securing two elements tol sisting'in placing the4element capable of being heating by induced electrical currentsadjacent a coil capable of establishing a high frequency magnetic field,moving said element and said coil together, establishing a highfrequency magnetic field of strength suflicient to induce heatingcurrents in said element, moving said element and said field togetheruntil sufficient heat has been generated in said element to effect atemperature capable of activating said bonding agent,

subjecting both elements to the heated bonding agent, and cooling theelements.

3. In the method of securing two elements to'- gether, at least one ofwhich is susceptible to heating by induced electrical currents and isre1- atively thin, and at least one of which carries a heat activatablebonding agent, the steps consisting in supporting the element capablelof being heatedby induced electrical currents adjacent means capable ofestablishing a high frequency'v 4. In the method of assembling laminatedarticles comprising groups of two elements by means of a heatactivatable bonding agent, at least one of said elements of each groupbeing capable of being heated by induced electrical currents .and beingrelatively thin, the steps consisting inpositioning a plurality of saidelements capable of being heated by induced electrical currents inconcentrated high frequency `magnetic fields, moving said elements andsaid fields while maintaining said elements in their respective fields,continuing such movement until the temperature reached in said elementsis sufficient to activate said bonding agent, and forming the laminatedarticles by cooling while the respective elements of each group are incontact with the heat activated bonding agent.

5. In the method of assembling crown closures including a metalliccrown, a sealing liner and a .heat activatable bonding agent carried byone of them, the steps consisting in supporting the crown adjacent meanscapable of establishing a high frequency magnetic field, moving thecrown and said means together, continuing such movement whileestablishing a high frequency magnetic field of strength suflicient toinduce heating currents in said crown, moving said crown and said fieldtogether until sufficient heat has been generated in said crown toeffect a temperature capable of activating said bonding agent, pressingsaid liner into engagement with said bonding agent and continuing theapplication of pressure until a union is effected by activation of saidbonding agent.

6. In the method of assembling crown closures including a metallic crownhaving head and skirt portions, a sealing liner, and a heat activatable'bondingagent carried by one of them, the steps consisting in creating ahigh frequency electrical field, supporting said crown with the fieldthreading the head thereof and moving said crown and field togetheruntil sufficient heat has been induced in vsaid crown to activate thebonding Aagent without the skirtportion' thereof toa'deletexious degree.'1. In the method of assembling crown closures bonding agent carriedbypne of them.. the steps consisting in creating a high frequencyelectrical field, supporting said crown with the field threading thehead thereof, moving said crown and field -together until suiiicientheat has been induced in said crown to activate the bonding agent, and'cooling the crown while maintaining the sealing liner 'and crown inengagement with'the activated bonding agent.

8. In an apparatus for securing two elements togetherfby generating heatin one of them by an inductive electrical action, a coil forestablishing a high lfrequency magnetic eld, a movevable supporttherefor. a stationary source of high frequency electrical current forenergizing said coil, means for communicating high frequency currentfrom said source to said coil at portions only along the path ofmovement of said coil, and means for deenergizlng the communicatingmeans as the coil is moving from one such portion to an adjacentportion- 9. In an apparatus for securing two elements together bygenerating heat in one of them by an inductive electrical action, a coilfor establishing a high frequency magnetic field, a moveable supporttherefor, a stationary source ofl high frequency electrical current forenergizing said coil. means for communicating high frequency currentfrom'said source to said coil including al segmental commutator, a brushfor engagement therewith, and means for deenergizing the source v whenthe brush is within arcing distance of a commutator segment with whichit is not then in contact.

10. In an apparatusfor securing two elements together, at least one ofwhich is susceptible to heating by induced electrical currents, a highfrequency generator for energizing a coil, said coil communicating withsaid high frequency generator through a segmental commutator and abrush. a source of low. frequency current communicated to said generatorand energizing the same and means for reducing the current supplied fromthe low frequency source to the high frequency generator attimed'intervals coinciding with the transfer of said brush from'onesegment of the commutator to another.

11. In an apparatus for securing two elements together, at least one ofwhich is susceptible tol heating by induced electrical currents, aV highfrequency generator for energizing a coil, said -high frequencygenerator including a quenched spark gap, and said coil communicatingwith-said high frequency generatorthrough a segmental commutator' and abrush, a source of electrical current communicated to said Vgeneratorand energizing the same and means for reducing the current supplied tosaid generator to a potential at which said quenched spark gas will notstrike.

12. In a machine for securing twov elements together by generating heatin one of them by induced electrical heating currents, a support for theelement to be heated, a generally fiat coil for establishing a highfrequency field positioned in proximity to the element to be heated withthe plane of the coil lying substantially parallel to the plane of theelement, said coil being formed of convolute turns with the center beinggenerally open to avoid self-heating, the

numberof turns being substantially equal along' any section through theaxis of the coil, means for energizing said coil, means for maintainingthe element to be heated in xed relationship with respect to the coil,and means for moving the coil-with the element to be heated,

413. In a machine for inductively heating a generallyilat surface of anelement, a moveable supportl for the element to be heated, a spiral coilstarting an'd terminating substantially on a line radial of the coil,having a generally open center to avoid self-heating of the inner turn,and formed of a generally fiat conductor, the minimum dimension of whichis disposed radially of the coil to provide spaces for cooling air tocirculate between tu'his while maintaining a desired cross sectionalarea, means for energizing said coil, means for maintainng the elementto be heated in fixed relationship with respect to the coil, and meansfor moving the coil with element to be heated.

14. The combination' with an apparatusfor inductively heating agenerally flat surface of an element, ofv a generally fiat coil forestablishing a high frequency magnetic field mounted 'upon the ` asupport, the plane of the coil lying substantially parallel to the planeof the support, a second suDDOrt for positioning an element with a atsurface to be heated lying in a plane substantially parallel to theplane of the coil, and means for imparting coincident motion to thesupports.

15. In'the method of securing by the action of heat an element to beheated in a limited area only to another element by.means of a heatactivatable bonding agent, said first mentionedelement being susceptibleto heating by induced electrical currents and being relatively thin, andat least one of said elements carrying a heat activatable bonding agent,the steps consisting in establishing a high frequency eld having asectional shape substantially corresponding to the area to be heated,positioning the element capable of being heated in the field so as to bepreferentiallly heated in the desired area. and moving said field andsaid element together until the element reaches a temperature suilicientto activate the bonding medium.

16. In the method of assembling crown closures including a metalliccrown, a sealing liner, and a heat activatable bonding agent, the stepsconsisting in creating a high frequency electrical field, positioningthe metallic crown in the field to preferentially induce heatingcurrents Vin the portion of the crown to be bonded to the liner, andmoving said crown and iield togetherl until .sumcient heat has beeninduced in the crown to .activate the bonding agent.

17. The combination with an apparatus for Securing two elements togetherby generating heat in one of them by induced electrical heatingcurrents, means for establishing a high frequency field, a supporttherefor, means for imparting rotation to said support, means movablewith said support and effective for positioning one of said .elements incooperative relationship with said establishing means, and pressuremeans for holding said elements together.

18. In an apparatus for securing two elements together by generatingheat in one of them by an inductive electrical action, a plurality ofcoils for establishing a plurality of independent high frequencymagnetic fields, means for supporting -19. Inan apparatus for securingan element to a'ilanged circulardisk, meansfor establishing a .highfrequency. iield of strength suiiicient to heat said disk, said fieldbeing of 4greatest. intensity at the central portion thereof, meanssupporting a flanged circular disk in the zone of said ileldestablishing means in such position "that said eld willithread said diskwith greatest intensity in the central portion thereof and means for zimparting coincident motion to the iield establishing means and the'disksupporting means.

20. In an apparatus for securing an element to -a circular disk, acircular coil for establishing a high frequency magnetic neld,supporting means for positioning a circular disk in axial align- --mentwith-said coil and means for imparting coincident motion to the coil andsupporting means.

"21. In an apparatus for securing two elements together by generatingheat in onen! them by inductive electrical action, a plurality oI-groupsof coils, for establishing independent high frequency magnetic fields,each group of'which is composed of a series of coils electricallyconnected, a support upon which said coils are mounted for rotation,means for supporting elements to be heated in said .ilelds, a stationarysource ot high frequency electrical current -for ener-v gizing saidcoils, means for communicating `cur -rent from Asaid source to one groupof'coils while another group remains deenergized, and means forimparting coincident motion to the coils and the supporting means.

22. In an apparatus for securing two elements together by generatingheat in one of them by inductive electrical actionl a plurality ofgroups vfor coincidentally moving the ileld establishing -means and thesupporting means.

'aisance of coils for establishing independent high frequency magneticelds,`each group or Y- which is 4composed of a series of coilselectrically connected. a support upon which said coils are mounted forrotation, means for supporting elet lishing a high -frequency magneticneld.'means -i'or supporting an element to be heated within the fieldestablished by said means and means 24. In the method of securing twoelements together, at least one of which is susceptible to heating byinduced electrical current and is relatively thin, and atleast one ofwhich carries a heat activatable bondingagent, the steps consisting insequentially feeding a seriesjof groups of said elements to a movingsupport, simultaneously subjecting the thin 4element of each group insaid series to a high frequency. field' while said elements areinmotion', moving said iields and elements together until a temperatureis reached suilicient to activate said bonding agent, simultaneouslyceasing heating action on said series, and thereaitersequentiallyremoving said element from said support.

' EMIL R. CAPITA.

CERTIFICATE opooRREcTIon. l

-December 26, 1959. EMIL R'. CAPITA.

Itis hereby certified thalt error appears in the printed specificationlof the above numbered petent requiring correction aefollows: Page 2,second column, line, Y214, for the word "radiators" read coils; page h,second column, line 2, claim 2, for "heating" read heated; page 5, firstcolnunn, line 61h claim 11', for "gasfread gap; and aecod'celm, line 18,claim 15, for "maintainng'f' read maintaining; line hh, claim l5, for."preferentiallly" read preferentially; and thatthesaid Letters Patentshould be reed with thin c'cncrecti-on `therein that thesame may conformtothe record of the `case in the Patent Office. I

signed ma sealed this 12th day of March, A. D. 19m.

-Henry Van Arsdale;

l (Seal) A l AActing Connni-aaioner of Patents.

'Patent I No. 2,18).|.,2l82.

QERT'IFIGATE oF. CORRECTION. t

December 26, 1959.

v EnIL R'. Ac APIm..

Itis hereby certified that error appears in the printed specification'of the above nmnbered patent. requiring correction aafollowe: Page 2,second column, line v214., for the word "radiators" read coils; page h,second c ollzunn,` line 2, claim 2, for "'heating" read heated; page 5,first column,

line '61 claim 11', for 'gasfread gap; and secod'clm, 11n@ 18, claim 15,for maintainngf' r'ead maintaining; line 141i, claim 15, for."preferenmanly read preferentially; and tnatthe'said Letters Patentsn'pula be read with this 'correction therein that thesame may conformtothe record of the case in the Patent Office. I

signed and sealed this 12th da; of March, A. D. 191,0.

-Henry Van Arsdale;

(Seal) -Aeting'Commiasioner of Patents.

